| Architecture | Library focused on the view layer. You choose routing, state management, and other tools separately. | Full framework with opinions on every layer. Routing, forms, HTTP, DI, and testing are all built in. |
| Language | JavaScript or TypeScript (optional but recommended). JSX for templates. | TypeScript required. HTML templates with Angular-specific directives and syntax. |
| Learning Curve | Lower initial learning curve. Core concepts (components, props, state) are simple to grasp. | Steeper learning curve due to TypeScript, RxJS, decorators, modules, and dependency injection. |
| Performance | Virtual DOM diffing with concurrent rendering. Server Components eliminate client JS for static content. | Signals-based reactivity (Angular 17+) with zone-less change detection for fine-grained updates. |
| State Management | Choose from Redux, Zustand, Jotai, Recoil, or React Context depending on complexity. | Built-in services with RxJS. NgRx or NGXS for Redux-style patterns in larger applications. |
| Ecosystem Size | Largest frontend ecosystem. NPM packages, UI libraries (MUI, shadcn), and community tools are abundant. | Smaller but curated ecosystem. Angular Material is the primary UI library. Fewer third-party options. |
| Mobile Support | React Native enables cross-platform mobile apps with shared knowledge and some shared code. | Ionic or NativeScript for mobile. Less native feel compared to React Native or Flutter. |
| Testing | React Testing Library, Jest, and Vitest. Community-driven testing patterns and best practices. | Built-in testing utilities with Jasmine and Karma. Angular CLI generates test files automatically. |